Keep isolated page import compatible with test type checking

packages/block-editor/test/preview-html.test.ts

@@ -18,7 +18,8 @@ test("separately bundled preview modules reuse one realm sanitizer", async () =>
   builderPreviewHTML("<p>First page</p>", doc);
   const key = Symbol.for("wrnexus.block-editor.preview-sanitizer");
   const first = (window as any)[key];
-  const secondModule = await import("../src/preview-html.ts?second-page");
+  const secondPageModule = "../src/preview-html.ts?second-page";
+  const secondModule = await import(secondPageModule);
   expect(String(secondModule.builderPreviewHTML("<p>Second page</p>", doc))).toContain("Second page");
   expect((window as any)[key]).toBe(first);
   window.close();